Left-hand-threading device.



' H. HUNTER. LEFT HAND THBEADING DEVICE. I APPLICATION FILED JULY 13I 1909.

976,880. Patented Nov. 29, 1910.

2 SHIEETSSHEBT 1.

. I l i! I m 1', O. H I I! l E I I M I H. M. HUNTER.

LEFT HAND THREADING DEVICE.

APPLICATION FILED JULY 13, 1909.

Patented Nov. 29, 1910.

2 QHEETS-SHEET 2.

Q TED new m. HUNTER; or onnvnnmia, omoi- 'hssienon 'ro 'rnn-"narroiihnnomn mu rscronme comm, or ctnvnm vmomo, A coaronarroiv or 01110.

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976,880. 1 specificationentic m nt, Patented Nov. 29, 1910;

Application'flled-l'uly 13,1soa' Serial no. 507,294.

To all whom it may-concern: Tis' slidable along the bed B of the machine Be it known thatI, HUGH 'M. HUNTER, and operated fi'omvthe main driving shaft M a citizen of the United States, residing in intermittently by suitable means, not shown.

Cleveland, in 'the county of Cuyahoga and .The carrier (1 shown also in 2 has a {5 State of Ohio, have invented certain new head 6 through thecenter. of which runs a and useful Improvements in Left-'Handdrivin shaft 7 that is; suitably operated:

Threadin Devices, of which the following from t emain shaft b means-not shown.

is a s .c' cation. v At another portion of eheadis a bearing This invention relates to the type of maaperture in which rotates ,the sleeve 8 shown chine tools generally known as automatic best in. Fig. 3 'and which carries a car 9 '65 I screw machines in which dflferent tools are ,fast thereto meshin with a gear 10 astorlautomatically and successively caused to the shaft 7 by which the sleeve s rotated operate on one or more pieces of. in' the from the shaft. I 1 machine. This invention relates especially In the bore of the sleeve 8 rotates freely 5 to the thread-cutting mechanism of su'ch'mag the spindle 3'Qcarry1n'g at one end the die 11- chines and has'for'it's' object to provide an thatis 1n allnement with the stock K in 4 "improved means'for'operatinga die to out the stock sp ndle -S, at the proper stage in a thread. 1 l the operation of the machine when the thread A further object of the-inventionto is to be cut. on the stock. The die spindle 0 provide means'foroperatinga' die in jconnec is endwise movable -in,the sleeve but has a tion with a'stock spindle that is rotatedin', shoulder 31. normallyv pressed against a the direction generally used for ht hand' shoulder 12 in the bore of the sleeve -b .a threads, wherebya left handdi coil spring ;13jthat.engages a-washer 14 ast a thread onkthe stock. on the die spindle extremity, while the other A furtherobjec't of vthe inv ti p videmeansforrotating thev stock a certain member fa'shthereon. But this permits the speed and meansforrotati'n anendwise niov-I :die to be advanced toward the stock and'the 1 able die spindle at "ajcerta nipredetermined' coil-spring willvbe thereby compressed servspeed less than thata'of the: stock hriin'fother ing to return the die when free to In words to retard the rotation "ofthedi'e' spinthe j normal position of these members, a 8 die during the cutting of the. thread,the or- .clutch member on the sleeve i s-in enga eganization being such that after thethread' ment with a clutch member connected with has been cut, the-die spindle is thenpermitted the diespindle. One or more longitudinally to rotate at the increased speed of the stock projecting pins 15 on the sleeve serve toand thereupon the speedof the stock spindle engage with a clutch pin 16 shown asfast is arrested while. that of the diespindle is to the die 11 itself. Therefore the rotation maintained at the same speed whereby the of the sleeve by. the ars from the shaft 7 1 die' will back oil from the thread on the will, normally cause e rotation of the die; stock. J p but if the die isadvanced permittingthe In the accompanying drawings illustrat pin 16 to swing free from the clutch pins ing one embodiment of my invention Figure 15, then the die spindle is free from the 1 shows in elevation a screw machine with sleeve at this clutch end.

my device applied thereto. Fig. 2 is a plan The method of wit 4 theleft hand view of the tool carrier and showing one thread with the stock spin le constantly rostock spindle and the end of the stock. Fig. tated to out a right hand thread is to rotate 3 shows most of the parts shown in Fig. 1,. thedie at a relative speed less than that at being partly in section and- Figs. 4 and 5 which the stock is rotated, and then as sufshow-the roller clutch in the free position ficient threadis cut, without stopping the and in the-locked position respectively. rotation of the die spindle sleeve, to arrest of -the spring engages the sleeve or e180 i In the machine shown in Fig. 1, which is the stock, whereupon the continued rotation a multiple spindle machine, the spindles S of the die will cause it to r ofifiom the and the stock K are carried by a head H, thread on the stock, for the tgason that the" and means are provided whereby the stock relative movements of these two members is rotated when brought to position for en-. are thereby reversed. During .f-th cutting gagement with the die. The tool carrier O operation therefore, the rotationlofiithe die 119 sleeve and spindle slower than the stock will havea tendency to cause the stock to carry the diespindle around with it at the same speed and the driving means for the die spindle and the sleeve therefore act negatively oras a retardin mechanism. But in the usual operation of t ese multiple spindle machines,-

since the tool carrier has a number of tools, as many as or more than thenumber oi stock spindles, the tool carrier is given a limited I movement of advance toward the stock, and

then is arrested, or shortl thereafter caused to-recede. Upon the a vance of the .carrier, the die will be brought into engageare out these threads. will act as a screw and the die 'as-Mnutwhereby the die'will be' drawn. up onto the stock. The stopping of.

the carrler at'gthis point will cause the die to advance and the die spindle to move endwise in the'sleeve, compressing the coil spring 13. But'this-will cause the pin'16 of the' clutch device to move off from the pin 15 of the clutch on the sleeve.

The several parts are so" arranged thatat the' time these memwith'the'rotating and tate' together at the-same and hence bers disengage asuflic'ient. thread will have been cut onthe stock. The *di'senga ment of clutch device. will "cause t 'e die spindle to be free fromthe'sleeve; and hence no' longer"retardedj from be advanced e gwo will rothe die will-notcut any-more thread audwill rotate at the-is'ame'speedyasithethis oint the" rotation of the 'stockis arreste and thereforemeans are provided 7 whereby the dieand'iispindle will be'rota'ted or carried around; with: the sleeve, that is constantly rotated, -which serve to :reverse the relative movements-of the die and stock causingithqldie to run off thestoc k. A -clutch device-"is 'rovided between-the die spindle andthe save that will permit the die spindle to rotate 'in'the same direction that the sleeve is rotated by'thegears from theshaft 7 at a eater spe'ed'than thatof the sleeve, but'w ich means will-cause the two members to lock and the sleeve to drive the s indle as soon as the rotation of the die spin le is'reduoed tothat of the sleeve which will result asso'on as the rotation'of the stock is arrested'to stop the stock. In the con- 'struction' illustrated a clutch is shown connecting these members, in the nature of a roller clutch. The other end of the sleeve 8 carries ahead 18 secured thereto.. A collar 19 is mounted on the diespindle and located inside of the head at 'oneend, and a hat ring 20 secured to: the head retains the collar. 19 in the same endwise osition in-- side of the head. .-This collar 15 provided with sockets. 21 in'its periphery having the die is reduce a; clutch mem I their bottom arranged at an angle relative to the tangent atthat point, all extending in the same rotative direction. Rollers 22 are located in the sockets between the same and the bore of the head 18. The rotation of the head in one direction will cause the rol s to ride up the incline and to jam or look by a wedging action whereupon the collar will be carried around with the sleeve. Obviously the rotation of the collar in the same directionbut faster than the head on the sleeve will be permitted. The collar is suitably connected with the die spindle to permit the endwise. movement of the latter relative to the sleeve and head, yet cause the collar and die spindle to rotate together. A key 23 rides in a slot 24 in the die spindle, and is also located in a slot 25 in the bore of -the collar, by which means the collar can slide on the die spindle yet always rotate therewith.-

The operation'of the device is as follows: The rotation of the sleeve will carry the die around with it at a certain speed, and the a stock being rotated at a greater speed, the engagement of the die with the stock upon advance of the carrier, will cause the die to cut the thread b reason of theengagement of the pins of t e clutch. thc carrier thethreads already cut by the 7 die willserve to advance the die endwise until the pins disengage.

N ow, the roller clutch'will permit the-die spindle upon these pins freeing the die spindle to rotate with the stock at-a greater speed than that-of the sleeve, whereby the die will cease to cut on the stock. But upon the stock being arrested at this sta e; as soonas the speed of d to that of the sleeve, the roller clutch will engage, and as the speed of the stock is further reduced, the; reverse relative movements of the die and stock will causethe die to run off from the stock. As

soon 'as the die leaves the stock, the spring will return it to osition of engagement of the two pin portlons of the clutch, and the carrier now returns to its former position.

Having thus described my invention, I- claim:

1. In a multiple spindle lathe, the combination of a carrier, a sleeve rotatable in the carrier, a die s indle rotatable in the sleeve, 1'- connected with the die spindle, a clutch member on the sleeve a rranged to enga e the clutch member on the die spindle, sai members being arranged to disengage upon relative endwisemovement of the ie spindle and sleeve, and a clutch having one member connected with the sleeve and the other member'connected with the die spindle, the latter clutch being orspindle in one direct on but to permit the die spindle to travel faster than the sleeve in the same direction.

ganized tocause the sleeve to drive the die Upon arrest of 40 actnatin'g?means, the organization being ef- 2. In a multiple spindle lathe, the combination of a carrier, a sleeve rotatable in the carrier but prevented from endwise movement, a die spindle rotatable in the sleeve, a clutch member connected with the die spindle, a clutch member on thesleeve arranged to engage the clutch member on the "die spindle to prevent the die spindle rotating faster than the sleeve is rotated in a certain direction, said members being arranged to disengage upon endwise movelment of the die spindle in the sleeve, a spring arranged to normally retain the diespindle in position .with said clutch memv b er's in engagement, and a clutch having one member secured to the sleeve and the other member connected to the'die spindle, the latter clutch-being organized to cause the sleeve to drix e the die spindle in said certain direction but to permit the die spindle 'to travel faster-than the sleeve in said direction, said clutch members being constructed and arranged for constant operative engagement throughout the endwise movement of the die spindle inthe sleeve.

3. In a threading machineythecombina- -tion of a. work carrying-spindle, actuating means for rotati ng the spindle at a predetermined speed,

oppin' means for holding the work carryin in I e stationaryv-ata predetermined time.a iespindle carrying a die,

shi fti-ng gnieans f and fromthe wor ,aetuatin means for rotat-- r actuating the die toward ing 1 6;311 a pre 'etermined speed during'jthe three; ing operation and less than carrying spindle, and means ;:at a predetermined time speed 'a thefw', -k =ca'rry1ng spindle, but at a greate peed {than the speed of'the die fecti'i-"e to permitthe die to back off on the stoppage of thel work carrying spindle on the continued rotation of such die spindle. V 4. In a multiple spindle lathe, the combination of a carrier, a sleeve rotatable in the carrier, means for preventing endwise movement of the sleeve on the carrier, 21 die spindle rotatable in the sleeve, a clutch mem her connected with the die spindle, a clutch member on the sleeve arranged-to engage thcclnteh member on the die spindle to the other member connected to the die 5 into' so for ,rotatin edie spindle at the sameprevent the die spindle rotating faster than the sleeve is rotated in a certain direction,

said members being organized and arranged to disengage upon endwise movement of the die spindle in the sleeve, and a clutch having one member. secured to the sleeve and dle, the latterelutch being organize cause the sleeve to drive the die spindle in said certain direction but vto permit the die spindle to travel faster than thesleeve in said direction, and means on said .clutch members constructed and arranged to retain them in operative engagement thro'u'hout the endwise movement 0 the die spin gain the sleeve. 1

' -5. In a threading machine, the combination of a work carrying spindle," actuating spindle at the same speed 'as the work 'zcarry- .ings indle, but at a greater speed than the spee of the die actuating means, the organization being; effective to. permitvthe die to back off on the stoppage of the work carrying spindle on thefg continued rotation of such ie spindle,sai' eans comprising a clutch 'memberon the die spindle thavlng notches in the periphery withv the. bottom walls inclined in the same rot atiY-e direction,

a sleeve loose on the spindle,-a"clutch 'inem her on the sleevesurrounding the saidcl'fljtfflil' ;v

member, rollers in the notches between the 1 I two clutch members permitting free rela .95 the movement in one direction but causing rotation of the die spindle by the sleeve. in the other direction, the sleeve clutch memher being connected therewith for axial movement but rotating therewith.

HUGH M2 HUNTER. \Vitnesses A. \V. HENN, W. S. CHASE. 

